Coupler pin steering box help please.

In your last two photos, note the distance between the outer column jacket & the shaft ring.

You may have collapsed the pins in the column?
Dunno on that, when using the pickle fork as a lever there was no other tool involved, (hammering, etc).....just a gentle one hand pry motion that easily slid the coupler off. Used the pickle fork as it fit perfectly over the gear spline.